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Night Reports 2022

In the tables below, Observing, Weather and Technical refer to time spent observing, time lost to bad weather, and time lost because of technical problems. Note that Observing includes time spent on calibration observations and, occasionally, scheduled on-sky test observations; Technical does not include scheduled downtime (e.g. for planned engineering work).

The Night Duty Officer estimates whether the night was photometric or non-photometric (spectroscopic) based on satellite imagery and SkyCam data obtained through the night. This is a qualitative assessment only and may not always be entirely accurate. IT IS POSSIBLE THAT, ON OCCASION, OBSERVATIONS REQUIRING PHOTOMETRIC CONDITIONS ARE ACQUIRED IN NON-PHOTOMETRIC CONDITIONS. Users should check the quality of their data carefully. Good, average and poor seeing refers to inferred zenith seeing of < 1.0 arcsec, 1.0-2.0 arcsec, and > 2.0 arcsec, respectively. Calima refers to a warm wind that occasionally blows over from the Sahara and brings a lot of fine dust forcing a shutdown to protect the optics.

SKYCAM MOVIES AND ATMOSPHERIC TRANSMISSION

Below we also provide links to Movies constructed from a sequence of optical images obtained with either SkyCam-A (covering the whole sky), SkyCam-T (now showing a 9 degree field centred on each target; was 21 deg pre-21 Oct) or SkyCam-Z (1 degree field). Images are obtained every minute or so throughout the entire night. These movies can usually be used to establish, qualitatively at least, how clear or cloudy a given night was. On bright nights (i.e. when the moon is up), the smaller-field camera's T and Z are often more useful than the full-sky camera A. Additional movies and still images are available from the Skycam Archive. Plots of SkyCamZ Zero Point data are also provided. Zero points here are defined with respect to APASS 10 < r < 13 with no colour term. These indicate to first order periods of thin or thick cloud. A clear night usually results in a flat distribution of ZP values, while thick cloud causes a dip in the ZP level. 'A', 'T' and 'Z' in the SkyCam columns refer to the camera from which the data were acquired.

August 2022

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
17 Aug8.10.00.0Photometric, average seeing T A T -
16 Aug8.10.00.0Photometric, good seeing T A T -
15 Aug8.10.00.0Non-photometric, seeing good becoming average/poor T A T -
14 Aug5.52.50.0Non-photometric, good/average seeing. Closed several times due to thick high cloud. T A T -
13 Aug7.40.30.3Started photometric with good seeing, but clouded over starting around 2am. Science fold position failure. T A T -
12 Aug7.90.00.0Photometric with good seeing. T A T -
11 Aug7.90.00.0Photometric with good seeing. T A T -
10 Aug7.90.00.0Photometric with good seeing. T A T -
9 Aug7.80.00.0Photometric with good/average seeing. T A T -
8 Aug7.80.00.0Photometric with good seeing. T A T -
7 Aug1.20.06.6Photometric with good seeing. RCS crash, auto-recovery failed. T A T -
6 Aug7.70.00.0Photometric with average/good seeing. T A T -
5 Aug7.70.00.0Photometric with good seeing. T A T -
4 Aug7.60.00.0Photometric with good seeing. T A T -
3 Aug7.60.00.0Photometric with average/good seeing. Very high calima. T A T -
2 Aug7.60.00.0Non-photometric with average seeing. T A T -
1 Aug7.60.00.0Non-photometric with average seeing. T A T -

July 2022

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 Jul7.60.00.0Non-photometric, good/average seeing. T A T -
30 Jul7.50.00.0Photometric, good seeing. T A T -
29 Jul7.50.00.0Photometric, average/poor seeing. T A T -
28 Jul7.40.00.0Photometric, good/average seeing. T A T -
27 Jul7.40.00.0Non-photometric, good/average seeing. T A T -
26 Jul7.40.00.0Non-photometric, good/average seeing. T A T -
25 Jul7.40.00.0Non-photometric, good/average seeing. T A T -
24 Jul5.51.90.0Photometric with average seeing. High humidity. SPRAT offline. T A T -
23 Jul5.41.90.0Photometric with average/good seeing. High calima and humidity at beginning of night. SPRAT offline. T A T -
22 Jul7.30.00.0Photometric with good seeing. SPRAT offline. T A T -
21 Jul7.30.00.0Photometric with good seeing. SPRAT offline. T A T -
20 Jul6.80.00.5Photometric with good seeing. Cas node reboot. SPRAT offline. T A T -
19 Jul3.63.30.3Photometric with average/good seeing. Cas node reboot. High calima in second half of night. SPRAT offline. T A T -
18 Jul7.20.00.0Photometric with average/good seeing. T A T -
17 Jul6.20.01.0Photometric, good seeing. Some SPRAT exposures blank T A T -
16 Jul7.20.00.0Photometric. Seeing good becoming poor T A T -
15 Jul7.10.00.0  T A T -
14 Jul6.90.00.3  T A T -
13 Jul6.90.00.3  T A T -
12 Jul7.10.00.0Photometric with good seeing. T A T -
11 Jul7.10.00.0Photometric with good seeing. T A T -
10 Jul0.07.10.0No operations, high levels of calima. - - - -
9 Jul0.07.00.0No operations, high levels of calima. - - - -
8 Jul70.00.0Photometric with average seeing. T A T -
7 Jul70.00.0Photometric with average seeing. T A T -
6 Jul70.00.0Photometric with good/average seeing. T A T -
5 Jul70.00.0Photometric with good/average seeing. T A T -
4 Jul70.00.0Photometric with good/average seeing. T A T -
3 Jul70.00.0Photometric with good seeing. T A T -
2 Jul70.00.0Photometric with good seeing. T A T -
1 Jul6.90.00.0Photometric with good seeing. T A T -

June 2022

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
30 Jun6.90.00.0Photometric with good seeing. T A T -
29 Jun6.90.00.0Photometric with good seeing. T A T -
28 Jun6.90.00.0Photometric with average/good seeing. T A T -
27 Jun6.90.00.0Photometric with average seeing. T A T -
26 Jun0.00.06.9Hydraulics fault T A T -
25 Jun0.00.06.9Hydraulics fault T A T -
24 Jun0.00.06.9Hydraulic chiller pump trip T A T -
23 Jun6.90.00.0Photometeric, good seeing. T A T -
22 Jun6.90.00.0Photometric, good seeing T A T -
21 Jun6.90.00.0Photometric, good seeing T A T -
20 Jun6.80.00.0Photometric, good seeing. T A T -
19 Jun6.80.00.0Non-photometric, good seeing. T A T -
18 Jun6.80.00.0Non-photometric, good seeing. T A T -
17 Jun5.11.80.0Photometric, good seeing, high humidity. T A T -
16 Jun6.90.00.0Photometric, good seeing. T A T -
15 Jun6.90.00.0Photometric, good/poor seeing. T A T -
14 Jun6.90.00.0Photometric, good/average seeing. T A T -
13 Jun6.90.00.0Photometric, average/poor seeing. T A T -
12 Jun6.80.00.1Photometric in good seeing. T A T -
11 Jun6.90.00.0Good - average seeing. Dust 20ug/m3 at start then dropped. T A T -
10 Jun5.80.01.1Good seeing, dust 10-20ug/m3. Oil system fault. T A T -
9 Jun6.90.00.0Photometric in good seeing conditions. T A T -
8 Jun6.90.00.0Photometric in good seeing conditions. T A T -
7 Jun70.00.0Photometric in good seeing conditions. T A T -
6 Jun70.00.0Non-phptpmetric. Seeing average, except bad for 1 hour from 11pm. T A T -
5 Jun70.00.0Photometric with good/average seeing. T A T -
4 Jun70.00.0Photometric with good/average seeing. T A T -
3 Jun70.00.0Photometric with good/average seeing. Autoguider failure. T A T -
2 Jun70.00.0Photometric with good/average seeing. T A T -
1 Jun70.00.0Non-photometric with good/average seeing. T A T -

May 2022

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 May7.10.00.0Non-photometric with good/average seeing. T A T -
30 May2.54.60.0Non-photometric with average seeing. High humidity. T A T -
29 May3.83.30.0Photometric with average seeing. High humidity. T A T -
28 May7.10.00.0Photometric with average/good seeing. T A T -
27 May7.10.00.0Photometric with good seeing. T A T -
26 May7.20.00.0Photometric with good seeing. T A T -
25 May7.20.00.0Photometric with good seeing. T A T -
24 May6.60.70.0Non-photometric with average/good seeing. Thick cloud. T A T -
23 May7.30.00.0Photometric with average seeing. T A T -
22 May7.30.00.0Photometric with average seeing. T A T -
21 May7.30.00.0Photometric, good seeing. T A T -
20 May7.30.00.0Photometric, good seeing. T A T -
19 May7.30.00.0Photometric, good seeing. T A T -
18 May7.40.00.0Photometric, good seeing. T A T -
17 May7.40.00.0Photometric, good seeing. T A T -
16 May7.40.00.0Photometric, good seeing. Half night on pointing model. T A T -
15 May7.40.00.0Photometric, good seeing. T A T -
14 May7.50.00.0Photometric, average/poor seeing. T A T -
13 May6.51.00.0Photometric, poor seeing, windy. Thick cloud in morning. T A T -
12 May5.02.50.0Non-photometric, good/average seeing. Thick cloud in last few hours of night. T A T -
11 May7.50.00.0Photometric, good seeing. T A T -
10 May6.70.90.0Photometric, poor seeing. High winds through night. T A T -
9 May7.60.00.0Photometric, good/average seeing. T A T -
8 May7.60.00.0Non-photometric in average seeing. T A T -
7 May7.70.00.0Photometric in good - average seeing. T A T -
6 May7.70.00.0Photometric with good - average seeing. T A T -
5 May6.51.30.0Photometric with good - average seeing. T A T -
4 May7.80.00.0Photometric conditions with good seeing tunring average towards end of night. T A T -
3 May7.90.00.0Photometric with good seeing. T A T -
2 May7.90.00.0Photometric with good seeing. T A T -
1 May7.90.00.0Photometric with average/good seeing. T A T -

April 2022

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
30 Apr7.90.00.0Non-photometric with average/good seeing. T A T -
29 Apr80.00.0Photometric with good/average seeing. T A T -
28 Apr2.65.40.0Non-photometric with good seeing. Thick cloud. T A T -
27 Apr80.00.0Non-photometric with average seeing. T A T -
26 Apr80.00.0Photometric with good seeing. T A T -
25 Apr0.05.13.0Oil chiller failure. High humidity. T A T -
24 Apr0.08.10.0High humidity. - - - -
23 Apr6.81.30.0Non-photometric, average seeing. High humidity. T A T -
22 Apr0.27.90.0Non-photometric, average seeing. High humidity. T A T -
21 Apr8.10.00.0Photometric, average seeing. T A T -
20 Apr8.20.00.0Photometric, average seeing. T A T -
19 Apr8.20.00.0Non-photometric, average seeing. T A T -
18 Apr0.00.08.2Telescope offline with hydraulics issue. - - - -
17 Apr0.00.08.3Telescope offline with hydraulics issue. - - - -
16 Apr0.00.08.4Telescope offline with hydraulics issue. - - - -
15 Apr8.40.00.0Photometric, poor seeing. T A T -
14 Apr8.50.00.0Photometric, average/poor seeing. T A T -
13 Apr8.50.00.0Photometric, good/average seeing. T A T -
12 Apr8.60.00.0Photometric, good seeing. T A T -
11 Apr4.04.60.0Non-photometric, good/average seeing. Thick cloud at times. T A T -
10 Apr8.60.00.0Non-photometric, average seeing T A T -
9 Apr8.60.00.0Photometric, good seeing T A T -
8 Apr6.60.02.0Non-photometric, good seeing. Autoguider fault T A T -
7 Apr8.70.00.0Photometric, good to average seeing T A T -
6 Apr8.70.00.0Photometric with good seeing T A T -
5 Apr0.00.08.8Weather monitor in Failed state T A T -
4 Apr0.08.80.0Ice risk. T A T -
3 Apr0.08.80.0High humidity. T A T -
2 Apr0.258.550.0Non-photometric with average seeing. High humidity for most of night. T A T -
1 Apr7.01.80.0Non-photometric with good/average seeing. Closures due to thick cloud. T A T -

March 2022

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 Mar8.90.00.0Photometric with average seeing. T A T -
30 Mar8.90.00.0Photometric with good seeing. T A T -
29 Mar4.44.60.0Non-photometric with average seeing. High humidity during first half of night. MOPTOP offline. T A T -
28 Mar09.00.0Ice risk T A T -
27 Mar0.09.10.0Ice risk T A T -
26 Mar0.09.10.0High humidity T A T -
25 Mar9.10.00.0Photometric conditions in good to average seeing. T A T -
24 Mar6.00.03.2Photometric, good to average seeing. T A T -
23 Mar0.09.20.0Icy weather, no observing. - - - -
22 Mar0.09.20.0Icy weather, no observing. - - - -
21 Mar0.00.00.0Offline for scheduled maintenance. - - - -
20 Mar0.00.00.0Offline for scheduled maintenance. - - - -
19 Mar0.00.00.0Offline for scheduled maintenance. - - - -
18 Mar0.00.00.0Offline for scheduled maintenance. - - - -
17 Mar0.00.00.0Offline for scheduled maintenance. - - - -
16 Mar0.00.00.0Offline for scheduled maintenance. - - - -
15 Mar0.00.00.0Offline for scheduled maintenance. - - - -
14 Mar0.00.00.0Offline for scheduled maintenance. - - - -
13 Mar0.00.00.0Offline for scheduled maintenance. - - - -
12 Mar0.00.00.0Offline for scheduled maintenance. - - - -
11 Mar9.50.00.0Non-photometric, good/average seeing. T A T -
10 Mar9.50.00.0Photometric, average seeing. T A T -
9 Mar9.30.00.3Photometric, good-average seeing. IO:O shutter sticking. MOPTOP failure during night. T A T -
8 Mar6.53.10.0Non-photometric, good to average seeing. IO:O shutter sticking and SPRAT offline for the night. Clouds towards end of night. T A T -
7 Mar9.60.00.0Photometric, good seeing. IO:O shutter sticking. T A T -
6 Mar9.70.00.0Non-photometric, good seeing. IO:O shutter sticking. T A T -
5 Mar9.70.00.0Photometric, average seeing. IO:O shutter sticking. T A T -
4 Mar6.03.70.0Non-photometric, good seeing. IO:O shutter sticking. T A T -
3 Mar3.95.90.0Photometric, good seeing. IO:O shutter sticking open. T A T -
2 Mar0.00.09.8No obs. Air system fault. T A T -
1 Mar9.60.00.2Non-photometric, seeing good/average. Air system fault T A T -

February 2022

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
28 Feb0.09.80.0Humidity. T A T -
27 Feb0.09.80.0Cloud - - - -
26 Feb0.09.90.0Humidity - - - -
25 Feb0.09.90.0Humidity & cloud - - - -
24 Feb0.09.90.0Ice on enclosure, no observing. - - - -
23 Feb0.010.00.0Ice on enclosure, no observing. - - - -
22 Feb0.010.00.0Ice on enclosure, no observing. - - - -
21 Feb0.010.00.0High humidity, ice and snow. - - - -
20 Feb0.010.00.0High humidity, ice and snow. - - - -
19 Feb0.010.00.0High humidity and ice. - - - -
18 Feb2.67.50.0Photometric, good/average seeing. High humidity and low temperatures. T A T -
17 Feb9.40.70.0Photometric, average seeing. T A T -
16 Feb10.10.00.0Photometric, average seeing. IO:O shutter problems. T A T -
15 Feb7.72.40.0Photometric, good/average seeing. Bad weather during the second half of the night T A T -
14 Feb9.70.00.4Non-photometric, high cloud, good/average seeing. Telescope focus problem at start of night. T A T -
13 Feb10.20.00.0Non-photometric, good seeing. T A T -
12 Feb10.20.00.0Photometric, good seeing. T A T -
11 Feb10.20.00.0Photometric, good-average seeing. T A T -
10 Feb5.84.40.0Non-photometric, some cloud and light rain at times. T A T -
9 Feb0.010.30.0No observing, cloud all night. - - - -
8 Feb2.57.80.0Non-photometric, cloud. T A T -
7 Feb5.74.60.0Non-photometric, calima in early morning. T A T -
6 Feb10.30.00.0Non-photometric. Seeing poor to average. T A T -
5 Feb6.44.00.0Non-photometric, poor seeing. T A T -
4 Feb0.010.40.0High humidity. - - - -
3 Feb0.010.40.0High humidity. - - - -
2 Feb0.010.40.0High humidity. - - - -
1 Feb0.010.40.0High humidity. - - - -

January 2022

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 Jan4.75.00.8Non-photometric, average seeing. Cloud. SMF stall. T A T -
30 Jan0.010.50.0High humidity and ice risk. - - - -
29 Jan0.010.60.0High humidity and ice risk. - - - -
28 Jan0.010.60.0High humidity and ice risk. - - - -
27 Jan0.010.60.0High humidity and ice risk. - - - -
26 Jan0.010.60.0Ice - - - -
25 Jan0.010.60.0High humidity and freezing temperatures - - - -
24 Jan0.010.60.0High humidity - - - -
23 Jan0.010.60.0No observing, high humidity. - - - -
22 Jan3.157.450.0Non-photometric. Good-average seeing. T A T -
21 Jan10.60.00.0Non-photometric. Good-average seeing. T A T -
20 Jan0.010.70.0High dust and humidity levels, no observing. - - - -
19 Jan0.010.70.0High dust. No observing. - - - -
18 Jan0.010.70.0High humidity. No observing. - - - -
17 Jan0.010.70.0High dust levels. No observing. - - - -
16 Jan0.010.70.0No observing. High dust and humidity levels. - - - -
15 Jan0.010.70.0No observing. High calima dust level. - - - -
14 Jan4.85.90.0Non-photometric, poor seeing. Closed when dust levels high. T A T -
13 Jan10.70.00.0Photometric, good to average seeing. T A T -
12 Jan8.22.50.0Photometric, good seeing. T A T -
11 Jan7.91.81.0Photometric, good seeing. Problem booting azimuth axis. Autoguider unavailable. T A T -
10 Jan0.010.80.0Humidity and rain. - - - -
9 Jan10.80.00.0Non-photometric poor seeing. High cloud. T A T -
8 Jan5.85.00.0Non-photometric average/poor seeing. High cloud. T A T -
7 Jan9.81.00.0Non-photometric average/poor seeing. T A T -
6 Jan9.41.40.0Photometric average/poor seeing. T A T -
5 Jan10.80.00.0Photemetric average/poor seeing. T A T -
4 Jan10.80.00.0Non-photometric poor seeing. T A T -
3 Jan10.80.00.0Photometric, average/poor seeing. T A T -
2 Jan10.80.00.0Photometric, good/average seeing. T A T -
1 Jan10.70.00.2Photometric, good/average seeing. Secondary Mirror Focus failure. T A T -